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    CVE-2023-4693

    An out-of-bounds read flaw was found on grub2's NTFS filesystem driver. This issue may allow a physically present attacker to present a specially crafted NTFS file system image to read arbitrary memory locations. A successful attack allows sensitive data cached in memory or EFI variable values to be leaked, presenting a high Confidentiality risk.

    Published:Oct 3, 2023
    Last Modified:Nov 7, 2025
    EPS:Oct 25, 2023
    EPSS Score:0.00009
    CVSS Score:5.3

    Affected Products

    Vendor
    Gnu
    Product
    Grub2
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    https://dfir.ru/2023/10/03/cve-2023-4692-cve-2023-4693-vulnerabilities-in-the-grub-boot-manager/https://dfir.ru/2023/10/03/cve-2023-4692-cve-2023-4693-vulnerabilities-in-the-grub-boot-manager/

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

    CVE-2025-61662 (CVSS 7.8) — A Use-After-Free vulnerability has been discovered in GRUB's gettext module. This flaw stems from a programmin…
    CVE-2024-45779 (CVSS 6) — An integer overflow flaw was found in the BFS file system driver in grub2. When reading a file with an indirec…
    CVE-2025-1125 (CVSS 7.8) — When reading data from a hfs filesystem, grub's hfs filesystem module uses user-controlled parameters from the…
    CVE-2024-45777 (CVSS 6.7) — A flaw was found in grub2. The calculation of the translation buffer when reading a language .mo file in grub_…
    CVE-2025-0686 (CVSS 6.4) — A flaw was found in grub2. When performing a symlink lookup from a romfs filesystem, grub's romfs filesystem m…
    CVE-2025-0689 (CVSS 7.8) — When reading data from disk, the grub's UDF filesystem module utilizes the user controlled data length metadat…
    CVE-2025-0684 (CVSS 6.4) — A flaw was found in grub2. When performing a symlink lookup from a reiserfs filesystem, grub's reiserfs fs mod…
    CVE-2025-0685 (CVSS 6.4) — A flaw was found in grub2. When reading data from a jfs filesystem, grub's jfs filesystem module uses user-con…
    CVE-2024-45782 (CVSS 7.8) — A flaw was found in the HFS filesystem. When reading an HFS volume's name at grub_fs_mount(), the HFS filesyst…
    CVE-2024-45778 (CVSS 4.1) — A stack overflow flaw was found when reading a BFS file system. A crafted BFS filesystem may lead to an uncont…

    References

    https://access.redhat.com/errata/RHSA-2024:2456
    https://access.redhat.com/errata/RHSA-2024:3184
    https://access.redhat.com/security/cve/CVE-2023-4693
    https://bugzilla.redhat.com/show_bug.cgi?id=2238343
    https://dfir.ru/2023/10/03/cve-2023-4692-cve-2023-4693-vulnerabilities-in-the-grub-boot-manager/
    https://lists.gnu.org/archive/html/grub-devel/2023-10/msg00028.html
    https://seclists.org/oss-sec/2023/q4/37
    https://access.redhat.com/errata/RHSA-2024:2456
    https://access.redhat.com/errata/RHSA-2024:3184
    https://access.redhat.com/security/cve/CVE-2023-4693
    https://bugzilla.redhat.com/show_bug.cgi?id=2238343
    https://dfir.ru/2023/10/03/cve-2023-4692-cve-2023-4693-vulnerabilities-in-the-grub-boot-manager/
    https://lists.debian.org/debian-lts-announce/2023/10/msg00007.html
    https://lists.fedoraproject.org/archives/list/[email protected]/message/FUU42E7CPYLATXOYVYNW6YTXXULAOV6L/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/OIRJ5UZRXX2KLR4IKBJEQUNGOCXMMDLY/
    https://lists.fedoraproject.org/archives/list/[email protected]/message/PERFILCHFEUGG3OAMC6W55P6DDIBZK4Q/
    https://lists.gnu.org/archive/html/grub-devel/2023-10/msg00028.html
    https://seclists.org/oss-sec/2023/q4/37
    https://security.gentoo.org/glsa/202311-14
    https://security.netapp.com/advisory/ntap-20231208-0002/

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High